Stroke-adjusting mechanism



Dec. 13, 1949 w. P s 2,490,881

STROKE ADJUSTING MECHANISM Fil ed Jan. 5, 1949 2 She'ets-Sheet 1 lul l I JNVENTOR.

,Dec. 13, 1949 w. e. PETERS STROKE ADJUSTING MECHANISM 2 Sheets-Sheet-Z Filed Jan. 5, 1949 INVENTOR. By 7147/!0/22 3921; w 2

17169 Itta/wey.

Patented Dec. 13, 1949 UNITED STATES IA'I'ENT OFFl-(JE STROKE-ADIUSTING MECHANISM William G. Peters, Oak Park, Ill. Ap lication January 5, 1949, Serial No. 69,395

This invention relates to certain new and useful improvements in stroke adiusting mechanism especially useful for use in connection with adjustin the stroke of a slide or ram 01 a shaping or planing machine.

As such, the invention has for its principal ob ject the provision of an improved construction of this character which facilitates adjusting the stroke of the ram without stopping the operation of the machine and ina manner whichwill assure the safety to the operator.

Another object of the invention is the provision of mechanism which is hereinafter described, which will result in a faster, smoother. and more efiicient operation of the shaver or planer.

Yet another object of the invention is to Provide a stroke-adjusting mechanism which coinprises relatively few parts, with the result that the same may be manutactured at an economical cost.

Other objects will appear hereinatter,

The invention consists in the novel combinetion and arrangement of parts to be hereinafter described and claimed.

The invention will be :best understood by reference to the accompanying drawings showing the preferred form of construction, and in which:

Fig. l is a fragmentary side elevational. View of a machine having incorporated therein my invention;

Fig. '2 is a fragmentary sectional detail view taken substantially on line 2-4 of Fig. 3,;

.Fig. 3 is a sectional detail view taken .substantially on line 3-3 of Fig. 1;

Fig. 4 is a fragmentary sectional detail View taken substantially on line lL-S of Fig. 2;

Figs. 5 and 6 are diagrams exhibiting the result of the stroke-adjusting mechanism embodying my invention.

The several salient objects of my invention are accomplished by the preferred form of construction shown in the accompanyin drawings and in which Hlindic'ates a housing or enclosure.

One wall ll of this housing provides a bearing l2 having a bore l3 within which is arranged a bushing 14. This bore (3 is in alignment with a bore l5 formed in a bearing 4-6 and having arranged in the bore l5 a bushing fl. This bearing l6 may be formed as an integral part of the opposite wall I 8. The bearing is provided a reduced end portion 19 on which threaded a retaining collar 20. I

Journa-lled in the bushings l4 and H are the end portions 20 and 2| of a crank shaft 22.

Arranged on the end portion 24 of the crank shaft is a pinion 23 meshing with a driven worm gear 24,- through the medium of which the crank shaft 22 is rotated; In the present instance a suitable enclosure :5 is provided for the pinion 2'8 and gear 24, and this housing may he remov ably attached to the wall 18 as by means of Mounted for oscillation on the reduced portion 1'9 of the bearing 16 is a arm 2-1, the rocker arm 21 being retained on this reduced portion 19 by the collar M.

The top wall 28' of the housing an elongated slot 29. The edge portions 3 6 of the wall l I provide an undercutgroove 31, while the edge portion 30' or the wall l8 provides a groove :34" substantially rectangular cross section.-

A slide or rams! is provided with tapered base edges 33 and 34, the base edge 33 heir-1g shaped to correspondto the groove 3!. The base edge 31 provides a tapered wall 35 spaced the adjacent vertical wall of the groove In this space fbhe tapered wall :35 and the vertical wall of the groove 3|,- is a retainer bar 38 secured to the" wall 18 in any approved manner By this arrangement the slide or rain is retained for reciprocatory movement with respect to the housing to over the elongated slot 2 9;

A clamp is indicated at 3'1. This clamp has a base portion n which is ada' N prov-ides pted to be drawn up tightly against the adlaeent wall 39 of the mm by means of a nut 40 threaded upon a threaded shank 4| formed as an integral part of the clamp 81. arrangement is such that by tightening the nut Ml upon the threaded shank 4!; the clamp 31 may he secured in a predetermined position with respect to" the ram 32. This clamp 37 provides a depending lug #2 which fits into a bifurcated end portion 18 of a link Ml and is connected thereto by a pin 1 5. The opposite bifurcated end portion of the link 44 receives the end portion 46 of the rocker rm 2! and is connected thereto oy a stud shaft 4-1, thus com pleting connection between "the rocker arm 21 and the slide or rain 32.-

A connecting rod is indicated at #8 and has" one end portion 4 9 connected to the crank 52 of the crank shaft r2; The opposite end portion of this connecting rod 48 provides a hearing 51. Connected at one side or this hearing 51 by means of a connecting pin 52 is 54. This link 54 at its-opposite end portion provides a bearing 55 which is connected to the a bearing 53 of a rocker arm 21 by a stud shaft 56 projected into a bearing 51 provided by the rocker arm 21.

Connected at the opposite side of the bearing by means of the pin 52 is a bearing 58 of a connecting link 59. This link 59 provides a bearing 60 having aligned bores Bi and 62 formed therein and of different diameters, the bore 6| being of the larger diameter.

A bolt 63 has a body portion 64 mounted in the bore GI and a reduced portion 65 which provides a threaded shank 66. This threaded shank 66 projects through the bore 62 and has threaded thereon a nut 61. This nut and the bearing 60 provide boss portions 51 which project into an arcuate slot 68 formed in the wall H of the housin ID.

By adjusting the the bolt 63 may be adjusted in a predetermined position with respect to the slot 68 whereby to change the fulcrum for the link 59.

The slide or ram 32 is of a standard construction and carries the tool chuck, 69 which likewise is of a well-known standard construction.

By adjusting the position of the bolt 63 toward the lower portion of the arcuate slot 68, the stroke of the rocker arm 21 will be shortened as shown in Fig. 6. By adjusting the bolt 63 toward the upper portion of the arcuate slot 68, the stroke of the rocker arm 21 will be lengthened as shown in Fig. 5. This adjustment may be made during the operation of the machine by the simple operation of moving the bolt 63 within the slot 68 through the manipulation'of the 'nut 61 after the same has been loosened. e

By varying the position of the bolt 63; within the slot 68, the are through which the connecting pin 52 travels will likewise bevaried-and the relative change of this position of the arc traveled by the connecting pin 52 determines the length of the stroke of the rocker arm 21.

A suitable door 68' is provided in the wall H whereby access may be had to the'interior of the housing.

From the foregoing description, it willbe apparent that I have provided a stroke-adjusting mechanism which is simple in operation, easily adjusted, and one which will be highly efiicient in use. e

To complete the invention I have provided on the connecting pin 52 at one endthereof an i sert 52 in the form of material capable of resisting wear. This insert 52' is adapted to bear against a relatively flat track 53 formed on one side of the rocker arm 21. i

This insert 52' in its bearing engagement on the track 53 cooperates with the link 59 and the pin 63 to resist lateral vibration of the rocker arm, which vibration otherwise should be transmitted to the slide or ram 32 and in turn transmitted to the tool stock, resulting in a defective shaved or planed surface on the work. By thus resisting the vibration of the rocker arm 21, the surface of the work operated upon will be substantially smooth, free from any imprints of the tool.

While I have illustrated and described the preferred form of construction for carrying my invention into eifect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I nut 61 upon the shank .66,

claim as new and desire to protect by Letters Patent is:

1. A stroke-adjusting mechanism for a machine having a crank shaft and a ram supported by a housing for reciprocatory movement, a bearing on said housing for said crank shaft, a rocker arm supported by said bearing, link connection between the rocker arm and the ram, a connecting rod carried by the crank shaft, link connection between the connecting rod and the rocker arm, a link having connection with the connecting rod, means providing a fulcrum for one end of said link, and means for adjustably connecting said last-named means to a wall of the housing.

2. A strokeadjusting mechanism for a machine having a crank shaft and a ram supported by a housing for reoiprocatory movement, a bearing on said housing for said crank shaft, a rocker arm supported by said bearing, link connection between the rocker arm and the ram, a connecting rod carried by the crank shaft, link connection between the connecting rod and the rocker arm. a link having connection with the connecting rod, means providing a fulcrum for one end of said link, means for adjustably connecting said lastnamed means to a wall of the housing, said lastnamed means including a bolt having connection with the connecting link and providing a threaded shank projecting through an arcuate slot in a wall of the housing and having a nut threaded on said shank to fix said bolt in a selected position with respect to said slot.

3. Stroke-adjusting mechanism for a machine having a housing, a reciprocating ram carried by the housing, bearings provided by adjacent walls of the housing, and a crank shaft journaled'in said bearings, comprising a rocker arm carried by one of said bearings and having link connection with the ram, a connecting rod having connectionwith the crank shaft, a link connection between the connecting rod and the rocker arm, and means cooperating with a wall of the housing and providing an adjustable fulcrum for said link member.

4.. Stroke-adjusting mechanism for a machine having a housing, a reciprocating ram carried by the housing, bearings provided by adjacent walls of' the housing, and a crank shaft journaled in said bearings, comprising a rocker arm carried by one of said bearings and having link connection with the ram, a connecting rod having connection with the crank shaft, a link connection between the connecting rod and the rocker arm, means cooperating with a wall of the housing and providing an adjustable fulcrum for said link member, said last-named means comprising an arcuate slot formed in said wall of the housing, a bolt carried by said link member and projecting through said slot, and a nut member threaded on said bolt for securing said bolt in a selected position with respect to said slot and for manipulating said boltfor movement relative to said slot.

WILLIAM G. PETERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

